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<article id="post-UML快速入门——活动图" class="h-entry article article-type-post" itemprop="blogPost" itemscope itemtype="https://schema.org/BlogPosting">
  
    
   
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        UML快速入门——活动图
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  <a class="meta-cate-link" href="/hexo-blog/categories/%E5%89%8D%E7%AB%AF%E7%AC%94%E8%AE%B0/">前端笔记</a>
   
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          <p>「这是我参与2022首次更文挑战的第26天，活动详情查看：<a target="_blank" rel="noopener" href="https://juejin.cn/post/7052884569032392740" title="https://juejin.cn/post/7052884569032392740">2022首次更文挑战</a>」</p>
<h2 id="活动图"><a href="#活动图" class="headerlink" title="活动图"></a>活动图</h2><p>活动图是描述过程逻辑、业务流程和工作流的技术。在许多地方，它们扮演的角色类似于流程图，但和流程图表示法之间的首要区别是它们支持并行行为。</p>
<p>下面是一个活动图的示例：</p>
<p><img src="./../imgs/4a38234af23e42f1bd98c2c2397c3dc1.png" alt="image.png"></p>
<h3 id="活动图的主要要素"><a href="#活动图的主要要素" class="headerlink" title="活动图的主要要素"></a>活动图的主要要素</h3><ul>
<li>初始节点 初始节点用<img src="./../imgs/69bd0195c4084280966f95ae944744c2.png" alt="image.png">表示，表示活动的开始。</li>
<li>分叉和合流 分叉和合并都以<img src="./../imgs/f5ebeffe23104624bd7cea053bad1fa2.png" alt="image.png">表示，分叉有一个输入流和若干个输出的流，合流又称结合，它则有若干个输入流和一个输出流。</li>
</ul>
<p>分叉并不是逻辑判断造成的分支，分叉的两个流在顺序上是无关的，或者是并行的。比如上图中，填写订单（fill order）和寄送发票（send invoice）是两个无关顺序的事件，可以先处理任意一件后再处理另一件。</p>
<p>如果有分叉而没有合流，说明这个活动只要任意分叉到达重点就结束。</p>
<p>合流旁边可以标注条件（结合规格）：</p>
<p><img src="./../imgs/4a95dd017a6a4efa8f4abb4382afda1c.png" alt="image.png"></p>
<p>这是一个饮料贩卖机，只有选择了投币并选择了饮料，且投币超过饮料的价格时才会继续往下（这里投币和选择没有先后关系）</p>
<ul>
<li><p>分支和合并 判断也成为分支，有一个输入流和若干个互斥的输出流。 <img src="./../imgs/52350b7339754e268c6d51be4abbbd53.png" alt="image.png">而合并有若干个输入流和一个输出流，它代表判断造成的条件分支的结束。</p>
</li>
<li><p>动作 <img src="./../imgs/270ab36fdc864158b7d47e8f5ebc4759.png" alt="image.png">表示动作，动作可以实现为类的方法，或者拆解为子活动。</p>
</li>
</ul>
<p>当我们需要拆解一个动作的时候，可以在动作内增加一个耙子符号。<img src="./../imgs/cedbde566e724fbc9aeb58746042da1b.png" alt="image.png"></p>
<p>子活动需要标注出活动名称，即该动作的名称：</p>
<p><img src="./../imgs/37ecaffba91e468f88930691a18d37e1.png" alt="image.png"></p>
<h3 id="流的结束"><a href="#流的结束" class="headerlink" title="流的结束"></a>流的结束</h3><p>流的结束用<img src="./../imgs/07c0a274944f470ba6d20b5df8a62c3f.png" alt="image.png">表示，它只是结束特定的流，流结束后活动的其他部分依然可以继续。 <img src="./../imgs/f7ba852d33624024aa23082379214dbd.png" alt="image.png"></p>
<h3 id="分区和泳道"><a href="#分区和泳道" class="headerlink" title="分区和泳道"></a>分区和泳道</h3><p>上面的活动图可以看出发生了什么，或者说做了什么，但是看不出这些活动由谁负责。如果需要由哪些类负责这些动作，可以使用分区。</p>
<p><img src="./../imgs/661fa47033d847afb2b799732ff39033.png" alt="image.png"></p>
<p>上图是一维分区，也成为泳道，UML 2.x中可以使用二维分区。</p>
<h3 id="信号"><a href="#信号" class="headerlink" title="信号"></a>信号</h3><p>前面的例子中动作的开始往往由上游动作触发，或者由活动触发。但动作也可能由信号触发。 <img src="./../imgs/a88f793d5035421bae5bf09dc91d0444.png" alt="image.png"> 上面这个例子中就没有合流，两条信号流在竞赛，第一个到达终点的将结束活动并终止其他流。</p>

        
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